Well, there has not been any official announcement yet about when everyone will get to play with Exchange 14; however, a little (not so deep) detective work yields some interesting information. By taking a quick look at the upcoming Microsoft TechEd conference sessions, we immediately notice a whole slew of Exchange 14 sessions. What that usually means is that the product should be available in beta BEFORE May 11th 2009, the day TechEd opens. If I was a betting man (and I am), I would bet on a public beta prior to May 11.
Get ready, this one will be fun!?!